Eraser



Patented Sept. 5, 1933 n ERASER William H. Hutter, Racine, Wis., asslgnor to Gertrude Reinke, Chicago, Ill., as

trustee Application September 24, 193i Serial No. 483,996

Claims. (Cl. 1Z0-36) The present invention relates to erasers, and is particularly concerned with erasers having a reserve supply of ereser'inaterial such as rubber, gum or the like, which is capable of being 5 fed outward to renew the eraser alter the rubber has been worn down from use.

One of the objects of the invention is the provision of an improved eraser having a reserve supply of erasing material which is conveniently l@ enclosed and protected in a handle or casing but which may be adjusted to renew the eraser as fast as the eraser wears down.

Another object is the provision of a simnliiied form of securing device for adjustably holding a supply of erasing material in a casing or handle in such manner as to keen the eraser in good condition, to support the working point of the eraser in a rnost advantageous way,and to perrait the readjustrnent of the erasing material to compensate for the wear due to its use.

Another object is the provision of a renewable eraser which may be readily renewed and trimmed to the desired shane by means of a trimming accessory furnished with the eraser casing.

Another object is the provision of an eraser which is efncient, economical, sturdy, and adanlfl ed to be carried about in the noclset of the user after the manner of a fountain nen or other writing and drawing accessories.

@ther objects and advantages of the invena tion will be apparent from the following description and from the accompanying drawing in which similar characters of reference indicate similar parts throughout the several views.

Referring to the single sheet of drawing.

IFig. l is a front elevational view of the eraser as it appears when completely enclosed.

Fig. 2 is a similar view of the eraser ready for use with the enclosing can rnounted u oon the end of the casing.

Fig. 3 is a sectional view taken on the plane of the line 3 3 oi Fig. l is an elevational view oi the supply of .erasing material and its supporting sleeve.

45 Fig. 5 is an enlarged sectional view taken. on

the plane of line 5 5 of Fig. 3, showing the details ci the can and trimming knife.

Fig. 6 is a sectional view taken-through the trimming lsnife on the plane of the line d-i of 5.

The erasers constructed according to the present invention are preferably enclosed in a conveniently portable casing siniilar to that eineJ r ployed for fountain oens, and consequently the.

eraser which is indicated in its entirety in Fig.

1, preferably includes a casing member l1, which may be constructed of any ornamental material such as hard rubber, pyrolin. celluloid, metal, phenolic condensation material such as bakelite, or the like.

The casing il is preferably substantially cylindrical and provided with an axially extending bore l2, and if desired the end it of the casing may be tapered for ornamental reasons and for the purpose of receiving and supporting a can i4. @5

The cap la is preferably constructed of the sam kind of material as the casing il, and may be nrovided with a reinforcing metal band i5, and with a spring clin i6 of any convenient type, and adapted to resiliently clamp the eraser to the clothing l@ of the user when the eraser is carried about on the person oi the user. The can la is preferably formed with an axially extending bore il adapted to receive the tapered working end it of the handle il, and the can is preferably provided with 'l5 internal threads adapted to engage comble-l rnentary threads 2b 'located adjacent the worlrm ing end it of the handle il.

Referring to lig. this is an elevational view of the supporting and reinforcing sleeve 2l for the body 22 of erasing material such as rubber, gunt or the like. libe body 22 preferably consists of an elongated cylindrical niece of rubber adapted to be slidably received in the sleeve 2l and provided with a working surface or point 23, preferably l/shaped in cross section, that is, the point 23 is beveled off at 2t on two diainetrically opposite sides so that the noint 23 is substantially wedge shaped and provided with a sharp edge its.

The sleeve Ell is preferably provided with a shank 25 of reduced size adapted to be slidably re= ceived in the bore l2 of the handle li. Irllhe sleeve 2l is also preferably provided with an outer end 22d of greater thickness forming an annular shoul- Sil vder il? for determining the ilnal position of the sleeve 2l in the handle ll.

The outer surface of the end 2d of sleeve 2l is preferably hush with the outer surface of casing ll. when the parts are assembled as in Fig. 3, but the sleeve 2l preferably tapers outward from the body to the handle ll, so as to prevent interioru ence Vbetwt-ien the sleeve 2l and the internal threadsls;

Th'shanlr 25 or" sleeve 2l is preferably *Lei-ovided with one or more longitudinally extending slots 28 which are adapted to receive elongated prongs 29 having inwardly extending pointed ends 30. The @ronge 29 are initially adapted to remain in the position shown in Fig. fl, with the body of lll@ the prong projecting outward from the shank of sleeve 25, and the points 30 of the prongs withdrawn from the bore 31 of the sleeve. The bore 31 of the sleeve is adapted to slidably receive the 5 rubber body 22 of erasing material, and permit the ready adjustment of the rubber eraser in the sleeve 21 when the prongs are in the position of Fig. 4.

Whenthe sleeve and rubber eraser are inserted in the handle 11 as shown in Fig. 3, the bodies of the prongs 29 slidably engage the inside of bore 25, and the walls of the casing 1l cam the prongs 29 inward until the points 30 engage in the rubber body 22. The sleeve is held in the handle l1 l5 by frictional engagement of the walls of the sleeve with the walls of the borel2, and by the friction produced by the resilient prongs 29, but the sleeve may readily be withdrawn by holding the handle in one hand and pulling on the sleeve with the fingers of the other hand.

It will thus be observed that the rubber eraser 22 may be used very conveniently by grasping the handle 1l in any convenient manner and. applying the point 23 to the lines, figures, characters or 25 the like which are to be erased.

Furthermore, as the rubber on the eraser inevitably wears down, the sleeve 21 may be drawn out of its casing ll and the rubber body 22 released by the prongs 30. The rubber body 22 may then be readily adjusted in the sleeve 21, and the sleeve and rubber eraser reinserted in the casing 11 where they will be held in the adjusted position, thereby permitting convenient readjustment of the length of the rubber 'eraser as the rubber wears down.

If desired the amount of rubber projecting from the casing or sleeve can be regulated at any time so that the rubber eraser may be given the maximum amount of support and reinforcement for erasing heavy work, and when the eraser is not in use it may be kept in good condition by enclosing the eraser in the cap 14. The cap 14 is adapted to be supported upon the tapered end 13 of the casing 11 when the eraser is in use, or the cap may be removed entirely.

In order to provide for the trimming of the working point of the eraser, the cap 14 is preferably provided with a plug 32 which is seated in the bore 17 of the cap 14 and which closes the open end 33 of the type of cap shown in Fig. 5. The plug 32 preferably has an annular flange 34 for engaging the end of cap 14 and fixedly supported in the plug 32 is a trimming and erasing knife 35.

The knife 35 comprises a sheet metal member preferably formed of tool steel or other material capable of maintaining a sharp working edge, and the knife is preferably formed with a pair of flanges 36, 3'7 joined together at their apex ou 38 to form a knife point which is substantially V-shaped in cross section. The outer edges 39 of the knife 35 are preferably beveled and sharpened from the outside and the edges 39 are preferably also beveled downward from the point 3D 40 as shown in Fig. 5, thereby providing a knife point which is adapted to produce a shearing action when the point 40 is pressed downward upon the rubber body 22. It will be evident that the knife 35 is peculiarly adapted to form the working point 23 in the rubber 22, as shown in Fig. 4,

and the present eraser is thus provided with a trimming knife which is adapted to be used to maintain the point of the eraser in the most desirable working condition.

The end of the cap 14 is preferably provided with external threads 41 and an auxiliary tip or cap 42 is preferably provided having-an axially extending bore 43 for receiving and enclosing the knife 35, the auxiliary cap 42 having threads 44 complementary to the threads 41 on the cap 14.

It will thus be observed that the knife 35 may also be used for particularly difficult erasures where it is necessary to remove some of the body of the paper or ink after which the cap 14 may be removed and the erasing conveniently finished by the use of the rubber 22.

The present eraser is capable of use for a long period of time and provides a convenient erasing accessory which should form a part of every fountain pen set or set of drawing equipment. The supply of erasing material such as rubber or gum may be readily fed outward as desired and when the rubber has been worn out it may be replaced with a new rubber eraser of the same form which may be conveniently trimmed and maintained in good condition by the trimming knife located in the cap.

While I have illustrated and described a specic embodiment of my invention, many modications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details set forth but desire to avail myself of all changes within the scope of the appendedclaims.

Having thus described my invention, what I claim is new and desire to secure by Letters Patent of the United States is:

1. In a renewable eraser device, the combination of an elongated body member having an elongated receptacle formed therein, with an open ended metallic member adapted to be slidably mounted in said receptacle to determine the position of an eraser body in said receptacle, a shoulder carried by said metallic member for determining the position of said metallic member in said receptacle, and a resilient prong member carried by said metallic member and normally urged toward a position outside the metallic member, said prong adapted to be forced into an eraser body by engagement of said metallic member with the walls of said receptacle.

2. In a renewable eraser device, the combination of an elongated body member having a bore formed therein for receiving an eraser body, with an open ended metal sleeve adapted to be slidably mounted in said bore to determine the position of an eraser body in said bore, said sleeve having an annular shoulder for engaging the end of said body member and said sleeve having a longitudinally extending integral prong formed out of its body, said prong being resiliently urged into a position outside the metal sleeve, said prong adapted to be forced into an eraser body by engagement of said metal sleeve with the walls of said receptacle when said shoulder engages the end of said body member.

3. An eraser holder comprising a casing open at one end, an eraser holding casing adapted to telescope therein comprising an enclosure open at both ends and having rigid walls for receiving and enclosing a rubber eraser therein, and a flexible finger formed on one of the walls of said eraser holding casing adapted to be flexed into clamping engagement with the eraser through engagement thereof with the wall of the casing.

4. An eraser holder comprising a casing open at one end, an eraser holding casing adapted to telescope therein comprising an enclosure open at both ends and having rigid walls for receiving and enclosing a rubber eraser therein, a nger cut from'the metal wall of said eraser holding casing so as to freely flex with respect thereto, and an inwardly extending projection formed on the free end of said nger adapted to be forced into the eraser by the rst mentioned casing upon the second mentioned casing being telescoped therein, said nger being adapted to spring outwardly therefrom upon said second mentioned casing being removed so as to permit adjustment of the eraser while the same is retained therein.

5. An eraser holder comprising a casing and a sleeve to embrace a rubber eraser insertible in said casing and having eraser engaging means in the form of a depressible inwardly hooked nger operable upon the insertion of said sleeve in said casing to prevent an eraser from moving therein.

WILLIAM H. HU'I'I'ER. 

